I can't, but help feel like a lot of users are missing the point here. I do admit, Bitcoin will have different use cases, and therefore different opinions on what's important. However, for me why I see not only why Bitcoin will be successful in the long term, but why it's required:
First, Bitcoin allows you to control your wealth, without relying on a third party, but still be able to spend it globally. This is groundbreaking. Some users touched upon it by saying decentralised, but go get into the nitty, and gritty details: Fiat can't be used globally, without relying on a bank or payment processor to handle your money. I.e, to use Ebay, you need a Paypal account, Paypal requires your credit card, which in return requires you to have a bank. That means, you need to have money deposited into a bank, which you no longer control, and likely give permission to that bank to gamble with your money. There's no guarantee you won't lose that money. Although, there are protection schemes in place, in certain countries which cover you up to like £85k or something like that. However, that's only for certain circumstances. Bitcoin, removes that need for a middle man, and a payment processor. You store your Bitcoin, you control the security, and you decide what you can, and can't purchase with it. This can be done globally, the only thing that competes with this level of control is cash, if you keep cash in hand, and not stored in a bank. However, the convenience of moving cash on a global level or even long distances within your own country, can be rather limiting. Bitcoin solves this problem.
Secondly, tackling the inflation problem. In fiat, you're guaranteed to get poorer. I can guarantee you that in the long term. In Bitcoin, it's deflationary by design, and thus smarter to use in the long term. However, that's not only it, Bitcoin can be scaled in the future, by using denominations, whereas fiat you've to keep printing off money or alternatively come up with a million different coins of the denominations.
Thirdly, Bitcoin has come at the right time. The world is converting to digital money, and Bitcoin has hit the nail on the head, by becoming somewhat known to everyone out there, during the time of this transmission. Thus, converting to a cryptocurrency (which does have its differences to digital money) becomes easier, and by doing so, people are securing their future in a much more robust technology, than the current implementations of digital money will give you.
Finally, I won't go into any more because I could legitimately be here all night describing you the benefits of Bitcoin. Anyway, finally you have the freedom that no other alternative provides, and I touched upon this earlier. You can use your Bitcoin where ever, whenever, and instantly.
This is without talking about things like the transparency due to the blockchain, chargebacks, security, privacy, which are all important factors to consider. However, I felt others talked about this enough not to include. PRIVACY is massive, though. If you don't care about it now, you'll probably be regretting that in the future.